Transum Software

Decimal Plus

Practise mental and written methods for adding and subtracting decimal numbers.

Level 1 Level 2 Level 3 Level 4 Description Help More Decimals

This is level 1; Adding and subtracting numbers up to ten with one decimal place. You can earn a trophy if you get at least 12 correct and you do this activity online.

1.1 + 3.3

Correct Wrong

2.3 − 1.2

Correct Wrong

3.3 + 3.3

Correct Wrong

4.1 + 4.9

Correct Wrong

4.3 + 4.3

Correct Wrong

5.4 − 3.5

Correct Wrong

5.4 + 6.5

Correct Wrong

3.6 − 1.5

Correct Wrong

7.5 + 6.5

Correct Wrong

10.1 + 10.9

Correct Wrong

7.8 + 8.6

Correct Wrong

7.8 − 2.7

Correct Wrong

9.8 + 8.7

Correct Wrong

7.8 − 4.8

Correct Wrong

8.9 + 8.8

Correct Wrong

Check

This is Decimal Plus level 1. You can also try:
Level 2 Level 3 Level 4

There is also an exercise on multiplication and division of decimals called Decimal Times.

Instructions

Try your best to answer the questions above. Type your answers into the boxes provided leaving no spaces. As you work through the exercise regularly click the "check" button. If you have any wrong answers, do your best to do corrections but if there is anything you don't understand, please ask your teacher for help.

When you have got all of the questions correct you may want to print out this page and paste it into your exercise book. If you keep your work in an ePortfolio you could take a screen shot of your answers and paste that into your Maths file.

Why am I learning this?

Mathematicians are not the people who find Maths easy; they are the people who enjoy how mystifying, puzzling and hard it is. Are you a mathematician?

Comment recorded on the 6 May 'Starter of the Day' page by Natalie, London:

"I am thankful for providing such wonderful starters. They are of immence help and the students enjoy them very much. These starters have saved my time and have made my lessons enjoyable."

Comment recorded on the 28 May 'Starter of the Day' page by L Smith, Colwyn Bay:

"An absolutely brilliant resource. Only recently been discovered but is used daily with all my classes. It is particularly useful when things can be saved for further use. Thank you!"

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A fascinating digit changing challenge. Change the numbers on the apples so that the number on the lemon is the given total. Can you figure out, by understanding place value, how this works?

Answers

There are answers to this exercise but they are available in this space to teachers, tutors and parents who have logged in to their Transum subscription on this computer.

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Learning and understanding Mathematics, at every level, requires learner engagement. Mathematics is not a spectator sport. Sometimes traditional teaching fails to actively involve students. One way to address the problem is through the use of interactive activities and this web site provides many of those. The Go Maths page is an alphabetical list of free activities designed for students in Secondary/High school.

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Are you looking for something specific? An exercise to supplement the topic you are studying at school at the moment perhaps. Navigate using our Maths Map to find exercises, puzzles and Maths lesson starters grouped by topic.

Teachers

If you found this activity useful don't forget to record it in your scheme of work or learning management system. The short URL, ready to be copied and pasted, is as follows:

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Scan the QR code below to visit the online version of this activity.

This is a QR Code

https://www.Transum.org/go/?Num=515

Description of Levels

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Level 1 - Adding and subtracting numbers up to ten with one decimal place

Level 2 - Adding and subtracting numbers less than one hundred with two decimal places

Level 3 - Adding and subtracting decimal numbers with a different number of decimal places

Level 4 - Real life problems involving the addition and subtraction of decimal numbers

There is also an exercise on multiplication and division of decimals called Decimal Times.

Finally there's the Decimals topic page which includes lesson Starters, visual aids, investigations and self-marking exercises.

Answers to this exercise are available lower down this page when you are logged in to your Transum account. If you don’t yet have a Transum subscription one can be very quickly set up if you are a teacher, tutor or parent.

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Adding and Subtracting Decimals

This video will teach you how to perform the basic operations with decimals.

Please remember to type in the zero before the decimal point for answers such as 0.4 because only typing in .4 will be marked incorrect.

Don't wait until you have finished the exercise before you click on the 'Check' button. Click it often as you work through the questions to see if you are answering them correctly. You can double-click the 'Check' button to make it float at the bottom of your screen.

Answers to this exercise are available lower down this page when you are logged in to your Transum account. If you don’t yet have a Transum subscription one can be very quickly set up if you are a teacher, tutor or parent.

Log in Sign up

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